: A special dummy table in Oracle used for selecting results from functions that don't belong to a specific table.
If you encountered this in a log or a search field, it is likely an automated probe by a security scanner or an attacker trying to identify vulnerabilities. CHR - Oracle Help Center : A special dummy table in Oracle used
: This part is intended to break out of a preceding SQL string (like a search filter or input field) by closing a single quote and a parenthesis. : A special dummy table in Oracle used